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@deftypefun {int} {gnutls_x509_ext_import_name_constraints} (const gnutls_datum_t * @var{ext}, gnutls_x509_name_constraints_t @var{nc}, unsigned int @var{flags})
@var{ext}: a DER encoded extension
@var{nc}: The nameconstraints intermediate structure
@var{flags}: zero or @code{GNUTLS_NAME_CONSTRAINTS_FLAG_APPEND}
This function will return an intermediate structure containing
the name constraints of the provided NameConstraints extension. That
structure can be used in combination with @code{gnutls_x509_name_constraints_check()}
to verify whether a server's name is in accordance with the constraints.
When the @code{flags} is set to @code{GNUTLS_NAME_CONSTRAINTS_FLAG_APPEND} , then if
the @code{nc} structure is empty
this function will behave identically as if the flag was not set.
Otherwise if there are elements in the @code{nc} structure then only the
excluded constraints will be appended to the constraints.
Note that @code{nc} must be initialized prior to calling this function.
@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS} (0) is returned, @code{GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE}
if the extension is not present, otherwise a negative error value.
@strong{Since:} 3.3.0
@end deftypefun
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